serio: Serial port ptm0 overlayfs: filesystem on './file0' not supported as upperdir ====================================================== WARNING: possible circular locking dependency detected 4.14.156-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/18506 is trying to acquire lock: (event_mutex){+.+.}, at: [] perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234 but task is already holding lock: (&event->child_mutex){+.+.}, at: [] perf_event_release_kernel+0x207/0x880 kernel/events/core.c:4397 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&event->child_mutex){+.+.}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 kobject: 'serio237' (ffff888055b6acb8): kobject_add_internal: parent: 'devices', set: 'devices' perf_event_read_value+0x7a/0x410 kernel/events/core.c:4447 perf_read_one kernel/events/core.c:4569 [inline] __perf_read kernel/events/core.c:4620 [inline] perf_read+0x40c/0x820 kernel/events/core.c:4633 __vfs_read+0x105/0x6a0 fs/read_write.c:411 vfs_read+0x137/0x350 fs/read_write.c:447 SYSC_read fs/read_write.c:574 [inline] SyS_read+0xfd/0x230 fs/read_write.c:567 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 serio: Serial port ptm1 -> #4 (&cpuctx_mutex){+.+.}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 perf_event_init_cpu+0xc2/0x170 kernel/events/core.c:11223 perf_event_init+0x2d8/0x31a kernel/events/core.c:11270 kobject: 'serio237' (ffff888055b6acb8): kobject_uevent_env start_kernel+0x3b6/0x6fd init/main.c:621 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:399 kobject: 'serio237' (ffff888055b6acb8): fill_kobj_path: path = '/devices/serio237' x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:380 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 -> #3 (pmus_lock){+.+.}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 perf_event_init_cpu+0x2f/0x170 kernel/events/core.c:11217 cpuhp_invoke_callback+0x1ea/0x1ab0 kernel/cpu.c:184 cpuhp_up_callbacks kernel/cpu.c:573 [inline] _cpu_up+0x228/0x530 kernel/cpu.c:1135 do_cpu_up+0x121/0x150 kernel/cpu.c:1170 kobject: 'serio236' (ffff888055773538): kobject_uevent_env cpu_up+0x1b/0x20 kernel/cpu.c:1178 smp_init+0x157/0x170 kernel/smp.c:578 kernel_init_freeable+0x30b/0x532 init/main.c:1067 kobject: 'serio236' (ffff888055773538): fill_kobj_path: path = '/devices/serio236' kernel_init+0x12/0x162 init/main.c:999 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 -> #2 (cpu_hotplug_lock.rw_sem){++++}: kobject: 'serio236' (ffff888055773538): kobject_cleanup, parent (null) lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] cpus_read_lock+0x3d/0xc0 kernel/cpu.c:295 static_key_slow_inc+0x13/0x30 kernel/jump_label.c:123 kobject: 'serio236' (ffff888055773538): calling ktype release tracepoint_add_func kernel/tracepoint.c:223 [inline] tracepoint_probe_register_prio+0x4d6/0x6d0 kernel/tracepoint.c:283 tracepoint_probe_register+0x2b/0x40 kernel/tracepoint.c:304 trace_event_reg+0x277/0x330 kernel/trace/trace_events.c:305 perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline] perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline] perf_trace_init+0x449/0xaa0 kernel/trace/trace_event_perf.c:221 kobject: 'serio236': free name perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:8106 perf_try_init_event+0x164/0x200 kernel/events/core.c:9342 perf_init_event kernel/events/core.c:9380 [inline] perf_event_alloc.part.0+0xd90/0x25b0 kernel/events/core.c:9640 perf_event_alloc kernel/events/core.c:9993 [inline] SYSC_perf_event_open+0xad1/0x2690 kernel/events/core.c:10097 kobject: 'serio237' (ffff888055b6acb8): kobject_uevent_env SyS_perf_event_open+0x34/0x40 kernel/events/core.c:9983 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #1 (tracepoints_mutex){+.+.}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 tracepoint_probe_register_prio+0x36/0x6d0 kernel/tracepoint.c:279 tracepoint_probe_register+0x2b/0x40 kernel/tracepoint.c:304 trace_event_reg+0x277/0x330 kernel/trace/trace_events.c:305 perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline] perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline] perf_trace_init+0x449/0xaa0 kernel/trace/trace_event_perf.c:221 perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:8106 perf_try_init_event+0x164/0x200 kernel/events/core.c:9342 kobject: 'serio237' (ffff888055b6acb8): fill_kobj_path: path = '/devices/serio237' perf_init_event kernel/events/core.c:9380 [inline] perf_event_alloc.part.0+0xd90/0x25b0 kernel/events/core.c:9640 perf_event_alloc kernel/events/core.c:9993 [inline] SYSC_perf_event_open+0xad1/0x2690 kernel/events/core.c:10097 SyS_perf_event_open+0x34/0x40 kernel/events/core.c:9983 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 (event_mutex){+.+.}: check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 kobject: 'serio237' (ffff888055b6acb8): kobject_cleanup, parent (null) __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234 tp_perf_event_destroy+0x16/0x20 kernel/events/core.c:8090 _free_event+0x330/0xe70 kernel/events/core.c:4238 kobject: 'serio237' (ffff888055b6acb8): calling ktype release free_event+0x38/0x50 kernel/events/core.c:4265 perf_event_release_kernel+0x364/0x880 kernel/events/core.c:4409 perf_release+0x37/0x50 kernel/events/core.c:4435 __fput+0x275/0x7a0 fs/file_table.c:210 ____fput+0x16/0x20 fs/file_table.c:244 task_work_run+0x114/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x7df/0x2c10 kernel/exit.c:874 do_group_exit+0x111/0x330 kernel/exit.c:977 get_signal+0x381/0x1cd0 kernel/signal.c:2413 kobject: 'serio237': free name do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 other info that might help us debug this: Chain exists of: event_mutex --> &cpuctx_mutex --> &event->child_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&event->child_mutex); lock(&cpuctx_mutex); lock(&event->child_mutex); lock(event_mutex); *** DEADLOCK *** 2 locks held by syz-executor.4/18506: #0: (&ctx->mutex){+.+.}, at: [] perf_event_release_kernel+0x1fd/0x880 kernel/events/core.c:4396 #1: (&event->child_mutex){+.+.}, at: [] perf_event_release_kernel+0x207/0x880 kernel/events/core.c:4397 stack backtrace: CPU: 0 PID: 18506 Comm: syz-executor.4 Not tainted 4.14.156-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234 tp_perf_event_destroy+0x16/0x20 kernel/events/core.c:8090 _free_event+0x330/0xe70 kernel/events/core.c:4238 free_event+0x38/0x50 kernel/events/core.c:4265 perf_event_release_kernel+0x364/0x880 kernel/events/core.c:4409 perf_release+0x37/0x50 kernel/events/core.c:4435 __fput+0x275/0x7a0 fs/file_table.c:210 ____fput+0x16/0x20 fs/file_table.c:244 task_work_run+0x114/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x7df/0x2c10 kernel/exit.c:874 do_group_exit+0x111/0x330 kernel/exit.c:977 get_signal+0x381/0x1cd0 kernel/signal.c:2413 do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a639 RSP: 002b:00007fe81386fcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000075c078 RCX: 000000000045a639 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075c078 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075c07c R13: 00007fffa0511f0f R14: 00007fe8138709c0 R15: 000000000075c07c kobject: 'loop4' (ffff8880a4ab92a0): kobject_uevent_env kobject: 'loop4' (ffff8880a4ab92a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (ffff8880a49e4920): kobject_uevent_env kobject: 'loop2' (ffff8880a49e4920): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (ffff88805547a5a0): kobject_uevent_env kobject: 'loop0' (ffff88805547a5a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (ffff8880a4b23320): kobject_uevent_env kobject: 'loop5' (ffff8880a4b23320): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (ffff8880a4a3c9a0): kobject_uevent_env kobject: 'loop3' (ffff8880a4a3c9a0): fill_kobj_path: path = '/devices/virtual/block/loop3' relay: one or more items not logged [item size (56) > sub-buffer size (9)] audit: type=1800 audit(1574689469.538:87): pid=18567 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="sda1" ino=17042 res=0 overlayfs: filesystem on './file0' not supported as upperdir kobject: 'loop0' (ffff88805547a5a0): kobject_uevent_env kobject: 'loop0' (ffff88805547a5a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'serio238' (ffff888049a4d5b8): kobject_add_internal: parent: 'devices', set: 'devices' serio: Serial port ptm0 kobject: 'serio238' (ffff888049a4d5b8): kobject_uevent_env kobject: 'serio238' (ffff888049a4d5b8): fill_kobj_path: path = '/devices/serio238' kobject: 'loop3' (ffff8880a4a3c9a0): kobject_uevent_env kobject: 'loop3' (ffff8880a4a3c9a0): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (ffff8880a4b23320): kobject_uevent_env kobject: 'loop5' (ffff8880a4b23320): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (ffff8880a4ab92a0): kobject_uevent_env kobject: 'loop4' (ffff8880a4ab92a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (ffff88805547a5a0): kobject_uevent_env kobject: 'loop0' (ffff88805547a5a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'serio238' (ffff888049a4d5b8): kobject_uevent_env kobject: 'serio238' (ffff888049a4d5b8): fill_kobj_path: path = '/devices/serio238' kobject: 'serio238' (ffff888049a4d5b8): kobject_cleanup, parent (null) kobject: 'serio238' (ffff888049a4d5b8): calling ktype release kobject: 'serio238': free name kobject: 'loop2' (ffff8880a49e4920): kobject_uevent_env kobject: 'loop2' (ffff8880a49e4920): fill_kobj_path: path = '/devices/virtual/block/loop2' relay: one or more items not logged [item size (56) > sub-buffer size (9)] kobject: 'serio239' (ffff88809cc92338): kobject_add_internal: parent: 'devices', set: 'devices' serio: Serial port ptm0 kobject: 'serio239' (ffff88809cc92338): kobject_uevent_env kobject: 'loop0' (ffff88805547a5a0): kobject_uevent_env kobject: 'loop0' (ffff88805547a5a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'serio239' (ffff88809cc92338): fill_kobj_path: path = '/devices/serio239' kobject: 'loop5' (ffff8880a4b23320): kobject_uevent_env kobject: 'loop5' (ffff8880a4b23320): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (ffff8880a4a3c9a0): kobject_uevent_env kobject: 'loop3' (ffff8880a4a3c9a0): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (ffff88805547a5a0): kobject_uevent_env kobject: 'loop0' (ffff88805547a5a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff88805547a5a0): kobject_uevent_env kobject: 'loop0' (ffff88805547a5a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (ffff8880a4a3c9a0): kobject_uevent_env kobject: 'loop3' (ffff8880a4a3c9a0): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (ffff8880a4ab92a0): kobject_uevent_env kobject: 'loop4' (ffff8880a4ab92a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (ffff88805547a5a0): kobject_uevent_env kobject: 'loop0' (ffff88805547a5a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (ffff8880a4b23320): kobject_uevent_env kobject: 'loop5' (ffff8880a4b23320): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'serio239' (ffff88809cc92338): kobject_uevent_env kobject: 'serio239' (ffff88809cc92338): fill_kobj_path: path = '/devices/serio239' kobject: 'serio239' (ffff88809cc92338): kobject_cleanup, parent (null) kobject: 'serio239' (ffff88809cc92338): calling ktype release kobject: 'serio239': free name kobject: 'loop2' (ffff8880a49e4920): kobject_uevent_env kobject: 'loop2' (ffff8880a49e4920): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'serio240' (ffff888082a5f478): kobject_add_internal: parent: 'devices', set: 'devices' serio: Serial port ptm0 kobject: 'loop0' (ffff88805547a5a0): kobject_uevent_env kobject: 'kvm' (ffff888219fb4dd0): kobject_uevent_env kobject: 'loop0' (ffff88805547a5a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'kvm' (ffff888219fb4dd0): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop3' (ffff8880a4a3c9a0): kobject_uevent_env kobject: 'serio240' (ffff888082a5f478): kobject_uevent_env kobject: 'serio240' (ffff888082a5f478): fill_kobj_path: path = '/devices/serio240' kobject: 'loop3' (ffff8880a4a3c9a0): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'kvm' (ffff888219fb4dd0): kobject_uevent_env IPVS: Error joining to the multicast group kobject: 'ip6tnl1' (ffff88808dda2f30): kobject_add_internal: parent: 'net', set: 'devices' kobject: 'ip6tnl1' (ffff88808dda2f30): kobject_uevent_env kobject: 'loop0' (ffff88805547a5a0): kobject_uevent_env kobject: 'ip6tnl1' (ffff88808dda2f30): fill_kobj_path: path = '/devices/virtual/net/ip6tnl1' kobject: 'queues' (ffff888054a62948): kobject_add_internal: parent: 'ip6tnl1', set: '' kobject: 'queues' (ffff888054a62948): kobject_uevent_env kobject: 'loop0' (ffff88805547a5a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'queues' (ffff888054a62948): kobject_uevent_env: filter function caused the event to drop! kobject: 'rx-0' (ffff888086c2d490): kobject_add_internal: parent: 'queues', set: 'queues' kobject: 'rx-0' (ffff888086c2d490): kobject_uevent_env kobject: 'rx-0' (ffff888086c2d490): fill_kobj_path: path = '/devices/virtual/net/ip6tnl1/queues/rx-0' kobject: 'tx-0' (ffff8880a8645d18): kobject_add_internal: parent: 'queues', set: 'queues' kobject: 'tx-0' (ffff8880a8645d18): kobject_uevent_env kobject: 'tx-0' (ffff8880a8645d18): fill_kobj_path: path = '/devices/virtual/net/ip6tnl1/queues/tx-0' netlink: 84 bytes leftover after parsing attributes in process `syz-executor.5'. kobject: 'kvm' (ffff888219fb4dd0): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop4' (ffff8880a4ab92a0): kobject_uevent_env kobject: 'loop4' (ffff8880a4ab92a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop4' (ffff8880a4ab92a0): kobject_uevent_env kobject: 'loop4' (ffff8880a4ab92a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (ffff88805547a5a0): kobject_uevent_env kobject: 'loop0' (ffff88805547a5a0): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (ffff8880a4b23320): kobject_uevent_env kobject: 'loop5' (ffff8880a4b23320): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (ffff8880a4a3c9a0): kobject_uevent_env kobject: 'loop3' (ffff8880a4a3c9a0): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'serio240' (ffff888082a5f478): kobject_uevent_env kobject: 'serio240' (ffff888082a5f478): fill_kobj_path: path = '/devices/serio240' kobject: 'serio240' (ffff888082a5f478): kobject_cleanup, parent (null) kobject: 'serio240' (ffff888082a5f478): calling ktype release kobject: 'serio240': free name